"Palazzo di Amore" in Beverly Hills, California 90210

Although this 43,000-square-foot Mediterranean estate is situated on a private tree-lined road in the center of America's most star-studded zip code, none of Hollywood's elite has made a move on it. Worthy of a starring role itself, the $129 million estate offers 12 bedrooms, 23 baths, a 10,000-square-foot wine cellar, and an entertainment complex, all surrounded by a reflecting pool, waterfall, and lush garden. Yet all of these astonishing amenities have been languishing since the lavish estate was listed in 2014. Removed from the market several times since then, the home was most recently relisted in March 2017.